Support for CLOB/BLOB type in oracle

Example usage:
```php
// INSERT
$key = dibi::getConnection()->getDriver()->bindData($data);
$key2 = dibi::getConnection()->getDriver()->bindData('...really long text...');
dibi::insert('BINTEST', array(
	'BLOB1%blob' => $key,
	'CLOB1%clob' => $key2,
))
    ->returning('%n, %n INTO %sql, %sql', 'BLOB1', 'CLOB1', $key, $key2)
    ->execute();

// UPDATE
dibi::update('BINTEST', array(
	'BLOB1%blob' => $key,
))
    ->where('id = %i', 1)
    ->returning('%n INTO %sql', 'DATA', $key)
    ->execute();

// SELECT
$data = dibi::select('BLOB1')
    ->from('BINTEST')
    ->where('id = %i', 1)
    ->fetchSingle();
```